Was playing with the command /mountspecial.. found this bug.
You run faster with an epic mount than intended, 120-200% something..
This is howto do it:
1. make a macro, the macro should contain 1 line only, just write /mountspecial there.
2. SPAM IT (put it to E or something so u can really spam it), run around with your epic mount while spamming it (for 10sec or more).
3. LOG OUT! (while mounted)
4. Log in with same character, dont dismount, stay mounted.
5. Run really fast!.
The speed goes away if you dismount & mount.. so you have to stay mounted after u have spammed the macro & relogged..
Tested & Working (as of PTR).
Tested on EU PTR btw.